Evaluation of phyllite and basalt associated with Azospirillum brasilense inoculation in oat cultivation

Resumen

The objective of this study was to evaluate the performance of white oat in the presence of phyllite and basalt dusts associated with Azospirillum brasilense inoculation. The experiment was conducted in a completely randomized design (n=5) with the following treatments: B, basalt dust; P, phyllite dust; A, Azospirillum brasilense; BA, basalt + Azospirillum brasilense; PA, phyllite + Azospirillum brasilense; C, Control. The following variables were evaluated: plant variables - emergence speed index (ESI), green mass (GM), dry mass (DM), root length (RL), plant height (H) and root dry mass (RDM); and soil variables - phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), aluminum (Al), potential soil acidity (PSA), sum of bases (SB) and cation exchange capacity (CEC). Phyllite application resulted in lower LR, but promoted the highest H and GM. On the other hand, basalt application increased RDM production when associated with inoculation. In addition, there was an increase in the base content of the soil when phyllite dust and basalt dust were applied. It can be observed that, throughout the cuts, the association of rock dusts with inoculation allows more stability of GM and DM production, increasing the forage potential of oat in the third cut by up to 20%. Phyllite and basalt application can elevate soil bases (K⁺, Ca⁺², Mg⁺²) when associated with Azospirillum brasilense. It is concluded that the association of phyllite and basalt with Azospirillum brasilense affects the chemical properties of the soil, promoting benefits to white oat cultivation.